INT 21,41 - Delete File

	AH = 41h
	DS:DX = pointer to an ASCIIZ filename

	on return:
	AX = error code if CF set  (see DOS ERROR CODES)

	- marks first byte of file directory entry with E5 to indicate
	  the file has been deleted.  The rest of the directory entry
	  stays intact until reused.   FAT pointers are returned to DOS
	- documented as not accepting wildcards in filename but actually
	  does in several DOS versions